Filter out escape sequence 'character set' select

reported #92 fix after #95 PrintStream copy of OutputStream

Author: hboutemy

jansi/src/main/java/org/fusesource/jansi/AnsiOutputStream.java

@@ -753,7 +753,7 @@ protected void processUnknownOperatingSystemCommand(int command, String param) {
      * @param options
      * @return true if the charcter set select command was processed.
      */
-    private boolean processCharsetSelect(ArrayList<Object> options) throws IOException {
+    private boolean processCharsetSelect(ArrayList<Object> options) {
         int set = optionInt(options, 0);
         char seq = ((Character) options.get(1)).charValue();
         processCharsetSelect(set, seq);

jansi/src/main/java/org/fusesource/jansi/AnsiPrintStream.java

@@ -61,6 +61,7 @@ public AnsiPrintStream(PrintStream ps) { // expected diff with AnsiOutputStream.
     private static final int LOOKING_FOR_OSC_COMMAND_END = 6;
     private static final int LOOKING_FOR_OSC_PARAM = 7;
     private static final int LOOKING_FOR_ST = 8;
+    private static final int LOOKING_FOR_CHARSET = 9;
 
     int state = LOOKING_FOR_FIRST_ESC_CHAR;
 
@@ -69,6 +70,8 @@ public AnsiPrintStream(PrintStream ps) { // expected diff with AnsiOutputStream.
     private static final int SECOND_OSC_CHAR = ']';
     private static final int BEL = 7;
     private static final int SECOND_ST_CHAR = '\\';
+    private static final int SECOND_CHARSET0_CHAR = '(';
+    private static final int SECOND_CHARSET1_CHAR = ')';
 
     @Override
     protected boolean filter(int data) { // expected diff with AnsiOutputStream.java
@@ -87,6 +90,12 @@ protected boolean filter(int data) { // expected diff with AnsiOutputStream.java
                     state = LOOKING_FOR_NEXT_ARG;
                 } else if (data == SECOND_OSC_CHAR) {
                     state = LOOKING_FOR_OSC_COMMAND;
+                } else if (data == SECOND_CHARSET0_CHAR) {
+                    options.add(new Integer('0'));
+                    state = LOOKING_FOR_CHARSET;
+                } else if (data == SECOND_CHARSET1_CHAR) {
+                    options.add(new Integer('1'));
+                    state = LOOKING_FOR_CHARSET;
                 } else {
                     reset(false);
                 }
@@ -189,6 +198,11 @@ protected boolean filter(int data) { // expected diff with AnsiOutputStream.java
                     state = LOOKING_FOR_OSC_PARAM;
                 }
                 break;
+
+            case LOOKING_FOR_CHARSET:
+                options.add(new Character((char) data));
+                reset(processCharsetSelect(options));
+                break;
         }
 
         // Is it just too long?
@@ -726,6 +740,21 @@ protected void processChangeWindowTitle(String label) {
     protected void processUnknownOperatingSystemCommand(int command, String param) {
     }
 
+    /**
+     * Process character set sequence.
+     * @param options
+     * @return true if the charcter set select command was processed.
+     */
+    private boolean processCharsetSelect(ArrayList<Object> options) {
+        int set = optionInt(options, 0);
+        char seq = ((Character) options.get(1)).charValue();
+        processCharsetSelect(set, seq);
+        return true;
+    }
+
+    protected void processCharsetSelect(int set, char seq) {
+    }
+
     private int optionInt(ArrayList<Object> options, int index) {
         if (options.size() <= index)
             throw new IllegalArgumentException();